# -*- coding: utf-8 -*-
# author: AZJ
# date: 2024/11/9
# 假如命运扼住了你的咽喉，你就去挠她的咯吱窝
def fib(n):
    a, b = 1, 1
    if n <= 1:
        return n
    for i in range(1, n-1):
        # print(b, end=" ")
        a, b = b, a + b
    return b

if __name__ == '__main__':
    print('\n',fib(7))